Q36 Wildcard Matching - LeetCode

PHOTO

Mon Mar 27 2023 10:09:19 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public boolean isMatch(String s, String p) {
        //Ques 36 , dp playlist
        
        int m = p.length() , n = s.length();
        boolean dp[][] = new boolean[m+1][n+1]; //+1 for empty string

    //last cell will be true , else last row and last colomn will be false
        
        //traversing reversely
        for(int i = m ; i >=0 ; i--){

            for(int j = n ; j>=0 ; j--){

                //if last cell
                if(i == m && j== n)
                dp[i][j] = true;

                //if last row
                else if(i == m)
                dp[i][j] = false;

                //if last coloumn
                else if(j == n){
                    //and * check below 
                    if(p.charAt(i) == '*')
                    dp[i][j] = dp[i+1][j];

                    //else outright false
                    else
                    dp[i][j] = false;
                }

                //for rest of the matrix
                else{
                    
                    //if ? , or char are same then check diagonally right
                    //else it stays false , which is by default
                    if(p.charAt(i) == '?' || p.charAt(i) == s.charAt(j))
                    dp[i][j] = dp[i+1][j+1];

                    //if * in rest of the matrix check right and below
                    else if(p.charAt(i) == '*')
                    dp[i][j] = dp[i][j+1] || dp[i+1][j];
                }
                
            }
        }

        // for(int i =0 ; i < m+1 ; i++){
        //     for(int j = 0 ; j < n+1 ; j++)
        //     System.out.print(dp[i][j] + " ");

        //     System.out.println();
        // }
        return dp[0][0];
    }
}

https://leetcode.com/problems/wildcard-matching/

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DP level 2

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